Smart helpers for PHP

draft.php

<?php

function is(&$variable, $filters)
{
	$filters = explode('|', $filters);
	
	$state = false;
	
	foreach ($filters as $filter)
	{
		switch ($filter)
		{
			case 'filled':
				$state = !empty($variable);
				break;
			
			case 'array':
				$state = is_array($variable);
				break;
		}
		
		if ($state === false) break;
	}
	
	return $state;
}

$a = array(4);

var_dump(
    is($a, 'filled|array'), // true
    is($b, 'filled|array') // false (notice, that $b is not even defined, yet there is no notice)
);

helpers.php

<?php

// Global flags to be used all around the new methods
define('ITERATOR_EMPTY', 1);
define('ITERATOR_INT', 2);

// Flag resolver
function get_flag_methods($flags)
{
    $functions = array();
    if ($flags & ITERATOR_EMPTY) $functions[] = function ($value){ return empty($value); };
	if ($flags & ITERATOR_INT) $functions[] = function ($value){ return !is_int($value); };

	return $functions;
}

// foreach with filters
function all(array $elements, callable $callback, $flags = 0)
{
	$methods = get_flag_methods($flags);
	
	foreach ($elements as $index => $element)
	{
		foreach ($methods as $test)
		{
			if (call_user_func($test, $element) ) continue 2;
	    }
        
		$callback($index, $element);
	}
}



// test
all(array('', 5, 'lol', 22), function ($key, $value) {
	echo $value . '<br>';
}, ITERATOR_EMPTY | ITERATOR_INT);